Finding the Fourth Proportional to 105,818.67, 158,349.06 and 91,636.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,818.67 : 158,349.06 = 91,636.31 : x
2. Step 2: Convert to fraction form
   105,818.67/158,349.06 = 91,636.31/x
3. Step 3: Cross multiply
   105,818.67x = 158,349.06 × 91,636.31
4. Step 4: Simplify right side
   105,818.67x = 14,510,523,946.24
5. Step 5: Solve for x
   x = 14,510,523,946.24/105,818.67
6. Step 6: Final answer
   x = 137,126.31